(*) [H.174] None has the right to be worshipped but Allaah, the Majestic, the Most Forebearing. None has the right to be worshipped but Allaah, the Lord of the Tremendous Throne. None has the right to be worshipped but Allaah, the Lord of the earth and the Lord of the Honourable Throne.

Whenever Allaah’s Messenger (Sallallaahu Alaihi Wasallam) became sick, he would recite Mu’awwidhat (Soorat Al-Falaq and Surat An-Nas) and then blow his breath over his body. When he became seriously ill I used to recite (these two Surah) and rub his hands over his body hoping for its blessings.

[Saheeh Al-Bukhaari, Hadeeth No. 535, Vol. 6]

Source : The Book Of As-Salaam (Greetings) : Chapter 20 – To perform Ruqya over a patient by reciting Al-Mu’awwidhat [Soorat Al-Falaq (113), and Soorat An-Nas (114) and blowing one’s breath and saliva over the patient while reciting these Verses. Al-Lulu Wal-Marjan,Compiled by : Fuwad Abdul-Baqi, Translated by : Dr. Muhammad Muhsin Khan